related to the flights. Under the CPAs, we are responsible for the
 cost of providing fuel for all flights and for paying aircraft rent
 for all of the aircraft covered by the CPAs. Generally, the
 CPAs contain incentive bonus and rebate provisions based upon each
 regional carrier’s operational performance. United’s
 CPAs are for 494 regional aircraft, and the CPAs have terms
 expiring through 2029. Aircraft operated under CPAs include
 aircraft leased directly from the regional carriers and those owned
 by United or leased from third-party lessors and operated by the
 regional carriers. See Part I, Item 2, “Properties” of
 this report for additional information.
In 2016 and 2015, Republic
 Airline Inc. (“Republic”), a wholly-owned subsidiary of
 Republic Airways Holdings (“Republic Airways”),
 purchased and took delivery of 16 new 76-seat Embraer S.A.
 (“Embraer”) E175 aircraft, and placed these aircraft
 into service under the United Express brand. Subsequent to the
 Chapter 11 bankruptcy filing by Republic Airways and certain of its
 subsidiaries in the first quarter of 2016, United entered into
 amendments to its CPA with Republic in 2016 for Republic to operate
 a total of 28 Embraer E175 aircraft, 16 of which were delivered as
 previously described and 12 of which remain to be delivered in
 2017. In connection with the amended CPA, United will own the 12
 remaining Embraer E175 aircraft.
In 2016, United agreed to
 purchase 12 new Embraer E175 aircraft that were previously expected
 to be purchased by one of its United Express operators, and in the
 first quarter of 2017, United entered into a CPA amendment with
 Mesa Air Group, Inc. (“Mesa Air Group”) and Mesa